def __init__(self, start, end, is_global):
self.start = start
self.end = end
self.is_global = is_global
self.prewritten = OrderedSet()
self.maybe_written = OrderedSet()
self.written = OrderedSet()
self.read = OrderedSet()
self.postread = OrderedSet()
self.postwritten = OrderedSet()
self.host_function = True
self.conditional = False
